Tension for sewing-machines.



No. 657,351. Patented Sept. 4, I900. L. A. MILLER.

TENSION FDR SEWING MACHINES.

(Application filed Jan. 29, 1900.)

(No Model.)

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nms ensns co. moxouruo wumnmou n c UNITED STATES PATENT OFFICE.

LEE A. MILLER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO SAMUEL B.

FULLER, OF WATERTOWN, WISCONSIN; MARY B. F ULLER ADMINIS- TRATRIX OF SAID SAMUEL B. FULLER, DECEASED.

TENSION FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 657,351, dated September 4, 1900. Application filed January 29,1900. Serial No. 3,094. (No model.)

To all whom it may concern:

Be it known that I, LEE A. MILLER, a citizen of the United States, and a resident of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention consists in certain peculiarities of construction andcombination of parts constituting a sewing-machine spool-thread tension mechanism; and said invention has for its object to improve the details of like mechanism set forth in my application for 15 patent, Serial No. 731,589, filed September 25, 1899, the improvements being hereinafter particularly described with reference to the accompanying drawings, and subsequently claimed.

Figure l of the drawings represents a partly sectional plan view of a portion of a sewingmachine arm and my improved spool-thread tension mechanism in connection therewith;

Fig. 2, a view of the assemblage, partly in vertical longitudinal section the spool-thread pincer, constituting part of said assemblage, being broken at intervals thereof; Fig. 3, a side elevation of the aforesaid assemblage, and Fig. 4 a detail partly-sectional View indicated by line 4 4 in the first figure.

Referring by letter to the drawings, A indicates a portion of the arm of a sewing-machin'e head provided with an upper elongate socket-bracket B, that constitutes a seat for a spool-thread pincer 0, this pincer being a strip of spring metal bent to form meeting jaws b, having their extremities clear of said.

bracket adjacent to a groove 0 therein, and as one of the features of 'my improvements one of the jaws is bent at a right angle to form a flange d in front of the other of said jaws, this flange being by preference ap proximately half-round. The jaw-flange is provided with a central horizontal open slot 6, intercepting an eye f, that portion of said flange above its eye being preferably less wide than the remainder and slightly offset from the same. The eye of the jaw-flange serves as a guide for spool-thread, and said flange constitutes a guard for preventing automatic displacement of said thread from the tension device.

with a shoulder g, that bears against said pincer opposite said nut; and adjustment of the screw regulates the tension of the pincerjaws upon the spool-thread.

The groove cin the socket-bracket B is sufficiently wide to permit of the jaws Z) of the screw-controlled tension device yielding in opposite directions to knots or other irregularities of spool-thread, and from the foregoing itwill be understood that as there is equal pressure at all times of the screw and nut on opposite sides of said tension device proper alinement of this device in said bracket is preserved, this being another important feature of my improvements.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isi 1. In a sewing-machine, the arm thereof provided with an upper elongate forwardlygrooved socket-bracket, a bent spring-metal plate seated in the bracket to constitute a spool-thread pincer having the jaws thereof expansible in the bracket-groove, one of these jaws terminating in a flange that crossingnot engaging soreW-having a shoulder op posing said pincer opposite said nut. i

3. In a sewing-machine; the arm thereof provided with an upper elongate forwardlygrooved socket brao'ket, a bent spring-metal plate seated in the bracket to constitute a spool thread pincer having the jaws thereof expansible in the bracket-groove, oneof these jaws terminating in a flange that crossing the front of the other jaw is provided with an eye intercepted by an open slot, an angular nut loose in a corresponding angular opening in one side of said bracket back of the pincerjaws, and a ln'aoket; pincer and nut engaging screw having a shoulder opposing said pincer opposite said nut.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

LEE A; MILLER. Witnesses: N. E. OLIPHANT, 'B. O. ROLOFF'." 

